/Engine/Source/Runtime/GeometryFramework/Public/DynamicMeshActor.h
Request a compute mesh from the Pool, which will return a previously-allocated mesh or add and return a new one. If the Pool is disabled, a newUDynamicMeshwill be allocated and returned.
[UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * AllocateComputeMesh()